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5.5 Exercise 5.3 Nullable and value types

  1. Add the following code at the end of your Main method: 

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    int integer1 = 3;
int integer2 = 3;
int? integer3 = 3;
int? integer4 = 3;

Console.WriteLine(integer1);
Console.WriteLine(integer2);
Console.WriteLine(integer3);
Console.WriteLine(integer4);
    • The first line assigns the value 3 to a variable of the primitive type.
    • The second line also uses a primitive type.
    • The third and fourth lines create nullable integers. The ? makes the value type nullable.
    • Note that int and int? can both be printed with Console.WriteLine; the compiler handles the conversion.
    • int? can hold null, which primitive int cannot.

  2. Run your program and note that the value 3 is displayed four times.